#VU59117 Out-of-bounds read in Contiki OS and uIP - CVE-2020-13987

Vulnerability identifier: #VU59117

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-13987

CWE-ID: CWE-125

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Contiki OS
Operating systems & Components / Operating system
uIP
Server applications / Other server solutions

Vendor: contiki-os.org
Adam Dunkels

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary condition in the uIP TCP/IP Stack component when calculating the checksums for IP packets in upper_layer_chksum in net/ipv4/uip.c. A remote attacker can send specially crafted traffic to the system, trigger an out-of-bounds read error and perform a denial of service (DoS) attack.

Mitigation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

Contiki OS: 3.0

uIP: 1.0

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External links
https://cert-portal.siemens.com/productcert/pdf/ssa-541018.pdf
https://us-cert.cisa.gov/ics/advisories/icsa-20-343-01
https://www.kb.cert.org/vuls/id/815128

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.